Phylloquinone = K1, derived from plants
Menaquinone = K2, derived from gut bacteria
Menadione = K3, derived synthetically
Function: Blood clotting, bone formation, antioxidant
Sources: Dark-green leafy vegetables, parsley, broccoli, cabbage, spinach, soy, egg yolks, liver, legumes, and synthesized by intestinal bacteria
Optimal Intake: 50 to 100 mcg
Deficiency Signs: Blood-clotting problems, osteoporosis, menstrual cramps
Toxicity: Hemolytic anemia